Cylinder construction for two-cycle internal-combustion engines



Oct. 21, 1930. R E ET AL 1,778,999

CYLINDER CONSTRUCTION FOR TWO-CYCLE INTERNAL COMBUSTION ENGINES FiledNov. 25,

I H IIIID III I H w; 5 H

James WGa/lowg.

Patented Oct. 21, 1930 UNITED STATES PATENT TOFFI C Ef HERALD B.GREENING, or HAMILTON, ONTARIO; CANADA, AND JAMES weauowrr;

or DETROIT, MICHIGAN, ASSIGNORS TO eALLowAY' ENGINEERING oomrANZ'iLrm;

ITED, OF HAMILTON, ONTARIO, CANADA CYLINDER CONSTRUCTION FOR TWO-CYCLEINTERNAL-COMBUSTION ENGINES Application filed November 23, 1928. SerialNo.- 321,356.

The principal objects of this invention are to produce cylinders of thetype in which two separate cylinders are joined by a head which forms acommon combustion space 1 n which the weight will be reduced to theminimum and will be suitable for aeroplane engine construction.

The principal features of the invention consist in the forming of thecylinders separately, then welding them together in such a manner as toprovide adequate seal for the common cylinder head which forms a commoncombustion chamber for the two cylinders.

In the drawings, Figure 1 is a plan view of the top of the cylinder headpartly broken away and showing the top end of the umted cylinders.

Figure 2 is a vertical mid-sectional View through the line 2-2 of Figure1.

In the construction of aeroplane engines it has been the practice toforge the cylinders and then machine the metal down to the minimumrequired thickness.

The cylinders A and B, the top ends of which are shown. herein, areconstructed 1n the above manner. Thetop flanges a and b respectively andthe radiating ribs 0 are flattened on a short chord X and the flattenededges are butted together and welded, thus joining the two cylinderssecurely together in parallel alignment.

V-shaped blocks D of the same thickness of the flanges a and b arefitted in between the converging edges of the said flanges where theyare secured together in the weld and the meeting edges of the blocks Dand the cylinder flanges are welded along the line d. These blocksextend the flange surfaces well beyond the bore of the cylinders andform with the cylinder flanges a continuous sealing surface extendingaround the pair of cylinders.

The cylinder head E may be of cast metal 5 and it is constructed of asubstantially elliptical shape, having a flange e to rest upon theflanges a and b, the side portions extending across the juncture of thetwo cylinders extending over the Welded-in blocks D. This constructionobviates any constriction of the chamber in inders.-

the head between the cylb. andthe volumetric capacity of the chamber aenclosed within the head above thetopsiof the cylinders is, figured inaccordance with the diameter and displacement of the cylinders softhatwhen the pistons operating in the cylinders move to the top of thecylinders, the chamber will contain an explosive mixture of therequiredpressure.

It will be noted that thellongitudinalarch of th'ecylinder headsterminates well inside the cylinder walls a andb so as to direct theflow of carburetted air from onecylinder. to the other in such a manneras to cause a verydefinite downward flow into one of the cylinders,which of course will be the cylinder,

having the exhaust port therein and the result is extensive turbulence.I

The joining of the two cylinders together in the manner describedenables the use of the light construction of cylinder with a longelliptical cap while retaining the lightest possible weight of materialsand a perfectly tight joint etween the cylinder head and cylinders wi 1be obtained.

The Whole structure is extremely rigid and strong.

What we claim as our invention is 1. A cylinder construction, comprisinga. pair of forged and machined cylinders having their head flangeswelded together, closure blocks fitting between the converging edges ofsaid head flanges and flush with the l pair of flanged cylindersarranged in parallel relation to each other having their head flangesflattened on one side abutting and welded together, a pair of V-shapedblocks inserted between and engaging the meeting peripheries of saidflanges and welded thereto, a cylinder head having a wide flangeextendin inwardly beyond the head'flanges of the c dinders, and anarched recess in the 5 undersi e connecting the two cylinders in a 30fillet blocks inserted between said head anges and permanently weldedthereto, and a com-' bustion head closing the head end of said cylindersand connecting their interiors.

5. An internal combustion engine cylinder as construction, comprisin apair of cylinders parallellyarranged an having turned head flangesermanently secured to ether in a welded oint and formin a contlnuoushead i flange the minimum widt of which is greater so than the averagebore of said cylinders, and

a-cylinder head spannin the ends of the two connected cylinders andsealed a ainst said continuous cylinder flange, said ead being arched toform a common combustion cham 35 her for said cylinders.

' HERALD B. GREENING. JAMES w. GALLOWAY'.

